Of all the sequels coming over the next couple years, X-Men: Days Of Future Past might be the most ambitious.

Director Bryan Singer is blending the old cast with the new cast - including the recently revealed Lucas Till returning as Havok - using a classic time travel storyline from the comics.

Now we're hearing that Fox is sending over a dozen cast members to Comic-Con this year, along with some top secret footage!

Ch-ch-check out the pics (below) for your own first look, courtesy of Bryan's twitter feed!

So what are the secrets that the footage supposedly reveals?

SPOILER ALERT:

Kitty Pryde (Ellen Page) sends Wolverine (Hugh Jackman, da doi) back in time to stop an assassination that leads to a mutant apocalypse in the future.

Along with the X-Men: First Class kids, Wolverine will face Magneto (Michael Fassbender), mutant-hunting robot inventor Bolivar Trask (Game Of Thrones star Peter Dinklage) and a young William Stryker (the villain from X-2, played by hot newbie Josh Helman).

Part of the plot reportedly requires the X-Men to find a power-siphoning mutant to help, which very well could mean the return of Anna Paquin as Rogue!

Got all that? Good! Because we're not going back in time and explaining it again!